Category: iOS

I’m trying to make a chart with a “toggle function”.

The “toggle function” what i wanted to make is this.

1. enter to UIViewController which Chart is in it
2. before singleTap on a chart, a chart has zoomPanModifier, XAxisDragModifier,, etc
3. after make singleTap on the chart, that chart has only CursorModifier.
4. CursorModifier’s UI stays on chart without disappearing and i can move crossed line to specific point i want (just like what CursorModifier originally does)
5. another single tap on chart would make a chart to have all other modifiers but CursorModifer.

–

What I have made successfully was 1,2,3,5 . not 4.

The way i was going to solve this problem was make fake touch event on Chart view and
snatch UIGestureRecognizer Event and let ChartView think they’re being touched till I give stop signal

But I heard that there is no more way to pass fake touch to UIView.

So I’m feeling difficulty on this problem…..

is there any easy way to solve this problem?

–

TL;DR;

I WANT TO MAKE CURSORMODIFIER’ UI STAYS ON A CHART!

+)
(lldb) po SciChartVersionNumber
0x3ff0000000000000

(lldb) po SciChartVersionString
0x474f525029232840

I wanted to know what version I’m using.. but i couldn’t know… what version am i using..?

I am considering applying server-side licensing for my javerScript application.

In the document below, there is a phrase “Our server-side licensing component is written in C++.”
(https://support.scichart.com/index.php?/Knowledgebase/Article/View/17256/42/)

However, there is only asp.net sample code on the provided github.
(https://github.com/ABTSoftware/SciChart.JS.Examples/tree/master/Sandbox/demo-dotnet-server-licensing)

I wonder if there is a sample code implemented in C++ for server-side licensing.

Can you provide c++ sample code?
Also, are there any examples to run on Ubuntu?

Hi, guys

Is it possible to use negative index for methods:

-(void) insertAt:(int)index X:(SCIGenericType)x Open:(SCIGenericType)open High:(SCIGenericType)high Low:(SCIGenericType)low Close:(SCIGenericType)close;

-(void) updateAt:(int)index Open:(SCIGenericType)open High:(SCIGenericType)high Low:(SCIGenericType)low Close:(SCIGenericType)close;

Can you give an answer?

Best regards,
Sushynski Andrei

I am planning to have a graph like in attached image. Just to have only X values and additional Label provider on it and an indication to point the value like black arrow.
Need your inputs. Thanks in advance.

I have followed the example at: https://www.scichart.com/documentation/ios/current/legend-modifier.html for creating a legend with a custom item.

The initial problem I am trying to solve is that the default legend has a black background but my chart is white. If I set the background of the legend to white, this is a problem because the series text is white, so you can’t read it any longer. Therefore in order to have a legend with a white background to match my chart, I needed custom legend items to be able to set the series text color to black.

I have created my ChartLegendCell.swift file based on the example and my ChartLegendCell.xib which has a UIView and a UILabel. I incorporate these into my code exactly as in the example. However the legend does not show up upon render. I added a breakpoint inside the ChartLegendCell.swift class and I see bindSeriesInfo method called twice per series. What I noticed is that the first time it is called, printing out self.bounds shows (0,0,230,35) which is correct, but the second time it is called self.bounds is (0,0,0,0).

Is there more code which needs to be added in the ChartLegendCell.swift to make sure the width and height aren’t 0?

So I want to draw multiple charts so is there any way I can have stacked yAxes like yAxis 2 should be drawn below yAxis1. I have gone through your example and there I got that we can add multiple surface but its becoming difficult for us to show a crosshair on all surfaces since we have a custom cross hair. Can you guide on same. Thanks in advance

I was testing my charts on a simulator and when I naved away and then back to the chart screen the Simulator’s chart was totally black screen; I could move the mouse over the points and the popouts would occur; and your license notice showed in the center of the chart. So it was almost like it thought all the drawing for the chart itself needed to be black on black.

It was always broken on the 2nd or later chart. Restarting the app fixed it. I tried removing all custom settings, and calling the invalidate; and nothing caused it to redraw correctly… Fortunately, when deploying to real devices everything worked correctly. Is this an expected side effect of testing on a simulator, or is their something that I can do to force a hard refresh of the chart…

FYI: The additional debug diagnostics don’t seem to do anything on a simulator, or at least I couldn’t find anywhere it was logged.

Hi, guys

I’m interesting in alignment for line at SCIAxisMarkerAnnotation. For example for top, middle and bottom position. Like at alignment_to_top.png. So is there some possibility for this?

UDP: Is there possibility to hide annotation from chart view?
Something like setHidden: for UIView.

Best regards,
Sushynski Andrei

Hey again!

Is there kind of a delegate that notify me if the user uses the crosshair/SCIRolloverModifier?
I want to know which value he is inspecting to show him further information outside the chart for this datapoint.

Thanks and Greeting
Benedikt

I’ve downloaded yesterday showcase example from your github: https://github.com/ABTSoftware/SciChart.iOS.Examples

After providing license key other samples work ok except Audio Analyzer (and the last sales dashboard – shows blank screen).

Problems is somewhere with SpectrogramSurfaceController ( If I commend it out wave plot and fft plot works)

Xcode shows there is some bad memory access at:
[SCIFastUniformHeatMapRenderableSeries internalDrawWithContext:WithData:]
cblas_sscal

Tested using:
iPhone 5SE
iOS 11.2.5
Xcode 9.2

Guys can you tell me please why I get this error after build on new `mac M1 chip and how to solve it:

error: unable to load standard library for target ‘arm64-apple-ios8.0’
/Users/nameuser/Projects/pojectname/ios/SciChart.framework/Modules/SciChart.swiftmodule/arm64.swiftinterface:1:1: error: failed to build module ‘SciChart’ from its module interface; the compiler that produced it, ‘Apple Swift version 5.1.3 (swiftlang-1100.0.282.1 clang-1100.0.33.15)’, may have used features that aren’t supported by this compiler, ‘Apple Swift version 5.3.2 (swiftlang-1200.0.45 clang-1200.0.32.28)’
// swift-interface-format-version: 1.0`

I cannot get SCILinearGradientBrushStyle working on a donut chart. Only radial gradients work

Here is my code sample:

let segment = SCIPieSegment()
segment.fillStyle = SCILinearGradientBrushStyle(colorCodeStart: 0xff007aff, finish: 0x4D007aff, direction: .horizontal)
segment.value = 100.0
segment.title = "Segment"
donutSeries.segments.add(segment)

The segment just renders a flat color

Hi, guys

Is there something similar like

• (void)bringSubviewToFront:(UIView *)view;
• (void)sendSubviewToBack:(UIView *)view;

from UIView but for chart Annotations?

Best regards,
Sushynski Andrei

When i try to run the simple Example from the Documentation ( with my trial License Key ) :

class AppDelegate: NSResponder, NSApplicationDelegate {
override init(){
// Set this code once in AppDelegate or application startup
SCIChartSurface.setRuntimeLicenseKey(“XXXXXX”);
super.init()

}

i receive this error and the application builds but fails to start :

libc++abi: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception ‘License Exception’, reason: ”
terminating with uncaught exception of type NSException

Hi,

I’m trying to achieve the looks of DateTimeCategory XAxis as shown on uploaded screenshot.

Formatting a single row of tick labels is not a hard task (setTextFormatting). The problem arises when there are 2 rows with same frequency (days of the week and dates) and third row with lower frequency (years).

I tried using new line character in text formatting property to break the line for days and dates and it didn’t work. I also tried having two axes bound to the same data series, each one having different formatting and majorDelta, but it seems that they don’t stack up (only first one added is shown).

Any ideas?

Hello,
I managed to implement a chart legend with a custom datasource (using just a SCIChartLegend object as a subview, not SCILegendModifier). However, I am unable to place the legend at specified position, it always snaps to upper-left corner of the screen. When creating a SCIChartLegend instance using the initializer that takes a Rect as a parameter, but not supplying a custom datasource, it draws correctly according to offsets specified by the supplied rect’s X and Y. It does respond to changes in the legendPosition property, but it still doesn’t allow to draw the view with any margins (which is what I’m actually trying to achieve).

When there are 2 or more horizontal/vertical axis, how to hide the cursor label for specific axis?

Hey guys,

Starting from 2.0 we can have dashed lines in renderable series. I was wondering can we have dashed line annotations as well?

I tried this:

verticalLineAnnotation.style.linePen = [[SCIPenDashed alloc] initWithColor:[UIColor redColor] width:2 withStrokeDashArray:@[@(10.f),@(3.f)]];

and got this build error:

Assigning to 'SCIPenStyle *' from incompatible type 'SCIPenDashed *'

Isn’t SCIPenDashed a SCIPenStyle?

Best,
Igor

We need to generate adhoc ipa file for review purpose and we are using the trial version, but its fails. Can you help us on the same?

Hello,
I would like to place a title for an X axis to the right of axis labels. I am easily able to achieve this on Android (see attached screenshot), but I cannot find relevant properties (axisTitlePlacement etc.) in iOS version of SciChart.

In the last section of this article in documentation you write that it is possible, however the links are dead (and frankly, the method names look suspiciously Java-ish to me).

Hello,

I am using mountain chart to draw some data. First time open the chart screen, the graph plots properly. If we do scroll forward the graph x-axis last label is missing. If we do scroll backward the graph x-axis first label is missing.

Here I have attached working .swift file.

Note: We are using mountain chart with multiple line series. We are not using stacked mountain chart.

Hello,

I would like to be able to change the rollover tooltip cursor color. It seems to be defaulted to the lineseries areastyle property color. I would like to be able to change it to a different color. I have not been able to find anything in the docs regarding how to do this.

Thank you

So for both SCIZoomPanModifier and SCIXAxisDragModifier you can set a clip mode, that will cause the graph to not zoom in if you try to scroll past the edges.

This is not possible for the y-axis however, so everytime anyone scrolls up or down to far, the graph zooms in, which is not useful to anyone ever

Is there any way to change this behaviour at all?

Thanks in advance

We’re using Xamarin.Forms. We were using iOS build 5019 and Android build 4441 and we had a custom DatelabelProvider set on our X axis in both platforms which worked fine.

However after updating to latest builds (5022 and 4459), the provider’s FormatLabel (FormatLabelFormatted on Android) isn’t being called and the default label formatting is applied.

Hello, I’m trailing your library right now. I would like to be able to move the graph around as well as a cursor on the graph. So I enabled both SCIZoomPanModifier and SCICursorModifier. But since both use one finger panning, the result wasn’t that good. Do you have any guidance for solving the conflict and letting them working together? I’m thinking to do it in the following way: if the touch location is within certain pixel range of the cursor, panning action will move the cursor, otherwise it moves the graph. Is it possible? Thanks

https://www.scichart.com/documentation/ios/v2.x/Tutorial%2002%20-%20Creating%20a%20SciChartSurface.html

Can someone please point me to where I can complete this tutorial.

Why end this tutorial like this??

// That’s it! The SCIChartSurface will now display on the screen with default axis ranges

As is, it simply displays the x and y values. Nothing else.

How can I add my x and y values so that I can display my graph

I would like to change the color of chart legend, but have failed to find information on how can I do this for iOS. Any sort of tutorial would be highly appreciated.

Worst case scenario would be to create a custom theme that is based on Bright Spark theme and update legend parameters there, but for this I would need to know what exactly does Bright Spark theme looks like.

Looking forward to any recommendations.

Best Regards,
Paul.

Hi,
we are using an UICollectionView to display different kinds of views in our application, including charts created with SciChart. We noted that every time a cell with a SciChart is loaded, some memory is allocated and not freed when the cell disappears, which leads to a massive memory leak and eventually crashes the application.
Is there a way to free SciChart resources on demand? Or maybe you suggest another solution to solve this issue?
Regards,
Anna

Hello everyone.
We are trying to migrate to V3 in our iOS project and we have many issues.
One of the most important is the implementation of vertically-draggable horizontal lines.
I have a nice working code for SCICharts V2 but I cannot find any similar example of how we can implement a custom modifier for moving an SCIHorizontalLineAnnotation vertically in V3.
We have done it already with the V2 but now that we have to migrate to V3 there is a huge missing part in your documentation.
Our code was using-overiding onPanGesture() in order to figure out if the modifier should handle the touching event, then we were using the touch point in order to find the closer horizontal lines and choose the closest one in order to change the vertical value depending on the touching-changing point.
The only similar example that I found in your documentation (https://www.scichart.com/example/ios-custom-modifier/) is using SCIGestureModifier which is not accesible by the V3.
I am trying to use your SCIChartModifierBase class but cannot find anywhere a similar example of what we need.
I already tried to understand how you want us to use the ” override func onEvent(_ args: SCIModifierEventArgs!) ” function of the
SCIChartModifierBase but still no luck, it is impossible to figure out without any kind of a similar example.
The reason of needing an example is that this task needs much more information like these:
1. How to decide if the modifier should handle the touch event and how it should be ignored or handled by the next modifier in the same group ?
2. How to handle the touch started, changed, cancelled events ?
3. How to say in realtime to other modifiers in the same group that we need to to handle the same event simultaneously with this custom modifier ?
4. How to say to the group of modifiers that after the first modifer is taken the touch event then the rest should not use it ?

I will paste here our current implementation that we have done for V2 and needs to be transformed to V3 in case you need more details.

An important part is how we add the modifiers on the chart and this is how we are doing it right now:
let zoom = SCIPinchZoomModifier()
zoom.direction = .xDirection
let group = SCIChartModifierCollection(collection: [CustomModifier(chart: self),
PanModifier(),
zoom])
//group.handleGestureFirstOnly = true // Not existing in V3 anymore ! How should we do it in V3 ?
chart.chartModifiers = group

I believe that this code will be really useful for many people out there even for V2 or for migrating to V3.

Swift iOs code using SCICharts V2:

class Modifier: SCIGestureModifier {
private weak var control: ChartView?
private var editingProperty: ChartView.BindableProperty?
private var calculator: SCICoordinateCalculatorProtocol?

    init(chart: ChartView?) {
        self.control = chart
    }

    override func onPanGesture(_ gesture: UIPanGestureRecognizer?, at view: UIView?) -> Bool {

        guard let chart = view as? SCIChartSurface,
            let gesture_ = gesture
            else { return super.onPanGesture(gesture, at: view) }

        let location = gesture_.location(in: chart)
        switch gesture_.state {
        case .began:
            control?.sendActions(for: .touchDown)
            editingProperty = testForDraggableLine(location: location, in: chart)
            calculator = yAxis().getCurrentCoordinateCalculator()
            if editingProperty != nil {
                // Annotations on SciChart don't have Zindex and we want current line to be on the top
                let draggableLines = control?.chart.annotations.array.compactMap { $0 as? DraggableLine }
                if let myLine = draggableLines?.first(where: { $0.bindingKeyValue == editingProperty }) {
                    control?.chart.annotations.remove(myLine)
                    control?.chart.annotations.add(myLine)
                }
                control?.isTouchingLine(isTouching: editingProperty != nil)
            }
            return editingProperty != nil
        case .changed:
            if editingProperty != nil {
                handleDraggingLines(location: location, in: chart)
                return true
            }
        case UIGestureRecognizer.State.ended:
            if editingProperty != nil {
                control?.sendActions(for: .editingDidEnd)
                editingProperty = nil
                _ = control?.adjustYRange(force: true)
                control?.sendActions(for: .valueChanged)
                control?.refreshPositions()
                control?.isNotTouchingLine()
                return true
            }
        case UIGestureRecognizer.State.cancelled:
            if editingProperty != nil {
                control?.sendActions(for: .editingDidEnd)
                editingProperty = nil
                _ = control?.adjustYRange(force: true)
                control?.sendActions(for: .valueChanged)
                control?.refreshPositions()
                control?.isNotTouchingLine()
                return true
            }
        default:
            break
        }

        return false
    }

    private func handleDraggingLines(location: CGPoint, in chart: SCIChartSurface) {
        guard let renderSurface = chart.renderSurface,
            let yCalculator = self.calculator,
            let editingProperty = editingProperty else { return }

        let pointInChart = renderSurface.point(inChartFrame: location)
        let valueForYAxis = yCalculator.getDataValue(from: Double(pointInChart.y))
        control?.setValue(Decimal(valueForYAxis), forKey: editingProperty.rawValue)
    }

    // SOS: Filter possible properties that can be returned. We want to always avoid return - and then - dragging the current price bid or ask !
    private func testForDraggableLine(location: CGPoint, in chart: SCIChartSurface) -> ChartView.BindableProperty? {
        let hitTestDistance: Double = 30 // Pixels !
        let nearItems = chart.annotations.array
            .compactMap { $0 as? DraggableLine }
            .filter { item in
                return item.bindingKeyValue != ChartView.BindableProperty.ask &&
                    item.bindingKeyValue != ChartView.BindableProperty.bid &&
                    !item.isHidden &&
                    item.yDistance(from: location) <= hitTestDistance
            }
        return nearItems
            .sorted { $0.yDistance(from: location) < $1.yDistance(from: location) }
            .first?.bindingKeyValue
    }
}

When calling SCIThemeManager.ApplyTheme(Surface, SCIThemeManager.SCIChart_Bright_SparkStyleKey); within a the code-behind running on the iPhoneSimulator running iOS 13.2, the iOS system throws an Objective-C exception with the following details:

Foundation.MonoTouchException: 'Objective-C exception thrown.  Name: NSInternalInconsistencyException Reason: applyThemeProvider: must be implemented in subclass

Although the exact same pattern works without issue on the corresponding Xamarin.Android project and the examples that call this line seem to be OK too, it is not clear from any documentation what this issue could be. Any advice would be appreciated.

Please tell me how to add the ability to use multiple touch. The goal is that when the user touches the screen in two places at the same time, two lines appear on the graph. I would like to understand whether this is possible?

I couldnt find IPointMarkerPaletteProvider Interface in SciChart iOS framework. I want to change the color of the point markers of line series on tapping the markers. With IPointMarkerPaletteProvider it would have been easier.

SCIPaletteProvider is there but how do I provide the colors to each markers through that. Is there any other way to go about it ?

Hi Sir/Madam,
I have created a Mountain Series with gradient fill. below is part of my code:

-(SCIRenderableSeriesBase *)getTimeSharePlot:(SCIXyDataSeries*)xySeries{
    SCIFastMountainRenderableSeries * rSeries = [SCIFastMountainRenderableSeries new];
    rSeries.dataSeries = xySeries;
    rSeries.strokeStyle = [[SCISolidPenStyle alloc] initWithColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:1] withThickness:1];
    rSeries.areaStyle = [[SCILinearGradientBrushStyle alloc] initWithColorStart:[UIColor colorWithRed:32/255.0 green:56/255.0 blue:124/255.0 alpha:1.0] finish:[UIColor whiteColor] direction:SCILinearGradientDirection_Vertical];

    return rSeries;
}

When i run the test, the chart is just filling with solid color
Would you please help?
BR,
Tommy

I want to modify SCICursorModifier in such a way that while user is doing pan gesture in x direction the line should always be in the centre of candlestick. How can i achieve this. For example there are 3 candlestick visible while panning from 0th x co-ordinate vertical line should be in the centre of first candlestick on more panning it will go to the centre of 2nd candlestick like rollover modifier

Hi, guys

My x axis is SCICategoryDateTimeAxis and i’m want to draw grid line with custom period. Let’s say every four hours for data with a period of thirty minutes. What is the best way for that?

Can i redifined axis’s tickCoordinatesProvider?
Can you provide some example?
Or it only possible with axes annotations ?

Best regards,
Sushynski Andrei

The wick for the up candlestick go through the body while the down candlestick do not. How can I make the wick inside the body part disappear? I didn’t change any settings of stroke and fill style. Thanks.

let candlestickSeries = SCIFastCandlestickRenderableSeries()
candlestickSeries.dataSeries = dataSeries
candlestickSeries.yAxisId = "right"

Good day! I have download this zip archive SciChart_iOS_SDK_4.2.0.5533.zip, on my laptop. Opened it and can not find the file SciChart.xcframework, according description from this article. I need to add library to Xcode frameworks, but I can not do it. Please can you tell me where can I get this file.